Thanks 🙂 I tried your suggestion, Martin, but plugging the noise in there really just thinned everything out. I managed to figure it out, though. I just needed to adjust what was going into the randomness of the Voronoi texture that controls the cracks.

The top noise texture here adds some curve to the lines and the bottom one breaks them up a little. It took me a minute to figure out where exactly to plug these in, but once I found it, it made sense. I ended up with this:

I really like the hard rock feel, too, Omar. And it looks really cool animated, too – it looks like it’s getting ready to explode. 😀